Question

Guidelines for grouping scores suggest you use _____________ groups.

the number of

less than 15

between 5 and 15

over 20

between 0 and 5

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Question 322 pts

In a frequency histogram, the horizontal dimension is called the _____________, and the vertical dimension is called the _____________.

ordinate; abscissa

y-axis; x-axis

ordinate; ascendent

abscissa; ordinate

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Question 332 pts

In a scatterplot, each data point represents _____________ measurement(s) from ______________ individual(s).

one; two

multiple; multiple

two; two

one; one

two; one

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Question 342 pts

Measures of _____________ indicate the extent to which scores within a set differ from one another.

differential tendency

relative frequency

diverse typicality

dispersion

central tendency

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Question 352 pts

The _____________ is the difference between the highest and lowest scores after the top 25% of the scores and the bottom 25% of the scores have been eliminated from the data.

modal range

approximated range

interquartile range

intermediate range

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Question 362 pts

The _____________ is the measure of central tendency that is most sensitive to extreme values in a distribution.

geometric mean

range

median

mean

mode

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Question 372 pts

If a distribution is less peaked than normal, it is said to be _____________; if it is more peaked than normal, it is said to be _____________.

kurtic; skewed

leptokurtic; platykurtic

skewed; kurtic

platykurtic; leptokurtic

abnormal; representative

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Question 383 pts

Determine the mode for the following data: 3, 4, 5, 5, 5, 6, 6, 7, 7, 8, 8, 8, 9, 9, 12. (3 points)

6 and 7

6.80

5.00

7.00

5 and 8

6.50

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Question 395 pts

Compute the sum of squares for the following data: 5, 7, 3, 5, 4, 8, 19. (5 points)

SS = 28.86

SS = 269.06

SS = 16.40

SS = 4.12

SS = 41.00

SS = 177.43

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Question 403 pts

If you take a four-hour drive through the country, and you drive exactly 60 mph for the 1st hour, 65 mph for the 2nd hour, 55 mph for the 3rd hour, and 75 mph for the 4th hour, what was your average speed? (3 points)

63.75

63.33

62.50

62.93

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Question 413 pts

If the lowest score in a distribution is 47 and the highest score is 99 and you use six intervals, what is the appropriate interval size? (3 points)

52

15

10

5

3

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Question 423 pts

The average person can hold 7+/-2 bits of information in their short-term memory with a mean of 7 and a standard deviation of 2. What is the variance? (3 points)

2

4

5.00 to 9.00

it depends on the sample size

9

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Question 433 pts

A teacher wants to determine the average score of students taking a newly developed test. Her students scored as follows: 40, 45, 60, 65, 70, 70, 70, 80, 90, 95. Compute the mean for the class. (3 points)

65.80

69.33

68.50

70.00

63.99

66.32

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Question 443 pts

Compute the variance for the following data set: 5, 7, 3, 5, 4, 8, 19. (3 points)

4.12

4.81

2.19

25.35

2.03

0.59

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Question 453 pts

If the SS for 25 students is 625, what is the standard deviation? (3 points)

more than 25

less than 25

1.00

exactly 25

3.00

Answer 1

Guidelines for grouping scores suggest you use between 5 and 15 groups.

QUESTION 322

In a frequency histogram, the horizontal dimension is called the abscissa, and the vertical dimension is called the ordinate.

QUESTION 332

In a scatterplot, each data point represents one measurement from two individual(s).

QUESTION 342

Measures of dispersion indicate the extent to which scores within a set differ from one another.

QUESTION 362

The range is the measure of central tendency that is most sensitive to extreme values in a distribution.

QUESTION 372

If a distribution is less peaked than normal, it is said to be platykurtic; if it is more peaked than normal, it is said to be leptokurtic .

QUESTION 383

given data

3, 4, 5, 5, 5, 6, 6, 7, 7, 8, 8, 8, 9, 9, 12.

values	frequency
3	1
4	1
5	3
6	2
7	2
8	3
9	2
12	1

Since 5 and 8 have highest frequency thatis=3,So modes are 5 and 8

?QUESTION 395

• sum 5+ 7+ 3+5+ 4+8+19=51

mean=sum/7=7.2857

sum of square=

SS=177.43

QUESTION 403

I drive exactly 60 mph for the 1st hour, 65 mph for the 2nd hour, 55 mph for the 3rd hour, and 75 mph for the 4th hour

average speed=(60+65+55+75)/4=63.75 mph

QUESTION 433

40+ 45+ 60+ 65+ 70+70+ 70+ 80+ 90+ 95=685

the mean for the class=685/10=68.5

QUESTION 443

• sum 5+ 7+ 3+5+ 4+8+19=51

mean=sum/7=7.2857

sum of square=SS=177.43

n=7

variance=SS/(n)=25.35

QUESTION 453

or,sd=

answer is less than 25